I have just realised that I have failed to pass on an interesting piece of information which I received in a PM from Matthew Edwards who did a bit of internet detective work. He said:


It seems the relationship to Sir Frank Brangwyn is very plausible since it was Frank and Philip's father, William Curtis Brangwyn, who initiated this particular spelling of the family name of Brangwin.

Thanks for that Matthew and perhaps it will turn up another lead????